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Chapter6-Regression.pptx

Correlation & Regression

Chapter 6

Correlation

Two sets of data have a correlation if they seem to depend on one another or if they share the same highs and lows

The correlation factor is a number between -1 and 1

The closer the correlation factor is to 1, the more correlated

Correlation Example:

Do the following sets of numbers seem to be correlated?

3 4 5 7

9 7 1 13

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Can crickets determine the temperature?

Regression:

A technique to use correlated data to predict the second variable when provided the first variable.

Regression Line:

What temperature is it if we detect the cricket chirps 14 times per second?

= 80.04 – (3.291 * 16.65) = 25.23